Updating trunk VERSION from 3690.0 to 3691.0

# This is an automated release commit.
# Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true
TBR=kariah@chromium.org

Change-Id: I8e7075eefe45fa21b135bd3e4da292b56db56c00
Reviewed-on: https://chromium-review.googlesource.com/c/1449372Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628237}

chrome/VERSION

 MAJOR=74
 MINOR=0
-BUILD=3690
+BUILD=3691
 PATCH=0